Observation of spin-charge separation and boundary bound states via the local density of states

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Observation of spin-charge separation and boundary bound states via the local density of states

Schoenauer, Benedikt; Schmitteckert, Peter; Schuricht, Dirk

(2017) Phys. Rev. B, volume 95, issue 20

(Article)

Abstract

We numerically calculate the local density of states (LDOS) of a one-dimensional Mott insulator with open boundaries, which is modelled microscopically by a (extended) Hubbard chain at half filling. In the Fourier transform of the LDOS we identify several dispersing features corresponding to propagating charge and spin degrees of freedom, ... read more thus providing a visualisation of the spin-charge separation in the system. We also consider the effect of an additional boundary potential, which, if sufficiently strong, leads to the formation of a boundary bound state which is clearly visible in the LDOS as a non-dispersing feature inside the Mott gap. show less